Hi fellow perlmonks, this morning I am trying to debug a program which is making use of Thread::Queue. Fortunately, the person who wrote it in the first place included an option "--debug" so the program does not use Threads, making debugging easier. However, I am encountering a problem which I currently have no clue how to tackle:

If I start the program in the debugger it blurts out error messages and dies: 
perl -d ./program --debug ~/github/sbin/programconfig

Loading DB routines from perl5db.pl version 1.44
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

lock can only be used on shared values at /usr/opt/perl5/lib/5.20.1/pe
+rl5db.pl line 4101.
BEGIN failed--compilation aborted at /usr/opt/perl5/lib/5.20.1/Thread/
+Queue.pm line 9.
Compilation failed in require at ./program line 1156.
BEGIN failed--compilation aborted at ./program line 1156.
lock can only be used on shared values at /usr/opt/perl5/lib/5.20.1/pe
+rl5db.pl line 4101.
END failed--call queue aborted at ./program line 1156.
lock can only be used on shared values at /usr/opt/perl5/lib/5.20.1/pe
+rl5db.pl line 2514.
END failed--call queue aborted at ./program line 8615.
Unbalanced scopes: 6 more ENTERs than LEAVEs

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If I start the same thing on the command line without the debugger, it just runs: 
./program --debug ~/github/sbin/programconfig

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I am a bit at loss how to properly debug this, as I am doing a feature extension and I am trying to hunt down an error. Any Ideas why Thread::Queue dies in the debugger but runs without the debugger? Looking at other questions regarding Thread::Queue it should be possible to debug it (although it could be hard with the threading). Also I admit, I don't quite understand the error message (the part about locking and the unbalanced scopes).

Appreciating any hints!
Yulivee

Update
I got this working. For anyone who stumbles upon this: Threads need to be explicitly enabled in the debugger, even if they are not in in use. As soon as a threads module is in user, one needs to start the debugger with perl -dt program.

In reply to Thread::Queue dies in debugger, runs without debugger (solved) by yulivee07

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